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data-v-06225672><a href="https://github.com/linxin1123" target="_blank" title="作者" class="beLink" data-v-06225672>lingxin</a></div> <div title="创建时间" class="date iconfont icon-riqi" data-v-06225672><a href="javascript:;" data-v-06225672>2023-02-26</a></div> <!----></div></div></div> <!----> <div class="content-wrapper"><div class="right-menu-wrapper"><div class="right-menu-margin"><div class="right-menu-title">目录</div> <div class="right-menu-content"></div></div></div> <h1><img src="">CSS篇(一)-cnblog<!----></h1>  <div class="theme-vdoing-content content__default"><h1 id="css篇-一"><a href="#css篇-一" class="header-anchor">#</a> CSS篇(一)</h1> <h2 id="一-题目目录"><a href="#一-题目目录" class="header-anchor">#</a> 一.题目目录</h2> <ol><li><a href="#q1">css sprite是什么，有什么优缺点</a></li> <li><a href="#q2">display:none与visiblity:hidden的区别</a></li> <li><a href="#q3">link与@import的区别</a></li> <li><a href="#q4">什么是FOUC？如何避免</a></li> <li><a href="#q5">如何创建块级格式化上下文(block formatting context),BFC有什么用</a></li> <li><a href="#q6">display、float、position的关系</a></li> <li><a href="#q7">清除浮动的几种方式，各自的优缺点</a></li> <li><a href="#q8">为什么要初始化CSS样式</a></li> <li><a href="#q9">CSS3有哪些新特性</a></li> <li><a href="#q10">display有哪些值，说明它们的作用</a></li> <li><a href="#q11">介绍一下标准的CSS的盒子模型？低版本IE的盒子模型有说明不同的</a></li> <li><a href="#q12">CSS优先级算法如何计算</a></li> <li><a href="#q13">对BFC规范的理解</a></li> <li><a href="#q14">谈谈浮动和清除浮动</a></li> <li><a href="#q15">position的值，relative和absolute定位原点是</a></li> <li><a href="#q16">display:inline-block什么时候不会显示间隙</a></li> <li><a href="#q17">PNG\GIF\JPG的区别即如何选择</a></li> <li><a href="#q18">行内元素float：left是否变为块级元素</a></li> <li><a href="#q19">在网页中应该使用奇数还是偶数的字体？为什么呢？</a></li> <li><a href="#q20">::before和:after中的双冒号和单冒号有什么区别?解释一下这两个伪元素的作用</a></li> <li><a href="#q21">如果需要手动写动画，你认为最小时间间隔是多久，为什么</a></li> <li><a href="#q22">CSS合并方法</a></li> <li><a href="#q23">CSS不同选择器的权重(CSS层叠的规则)</a></li> <li><a href="#q24">列出你所知道可以改变页面布局的属性</a></li> <li><a href="#q25">CSS在性能优化方面的实践</a></li> <li><a href="#q26">CSS3动画(简单动画的实现，如旋转等)</a></li></ol> <h3 id="q1">1. css sprite是什么，有什么优缺点</h3> <ul><li>概念：将多个小图片拼接到一个图片中，通过background-position和元素尺寸调节需要显示的背景图案</li> <li>优点
<ul><li>减少HTTP请求数，极大地提高页面加载速度</li> <li>增加图片信息重复度，提高压缩比，减少图片大小</li> <li>更换风格方便，只需在一张或几张图片上修改颜色或样式即可实现</li></ul></li> <li>缺点
<ul><li>图片合并麻烦</li> <li>维护麻烦，修改一个图片可能需要重新布局整个图片</li></ul></li></ul> <h3 id="q2">2. display:none;与visibility:hidden;的区别</h3> <ul><li>联系：它们都能让元素不可见</li> <li>区别
<ul><li>display:none;会让元素完全从渲染树中消失，渲染的时候不占据任何空间</li> <li>visibility:hidden;不会让元素从渲染树消失，渲染树元素继续占据空间，只是内容不可见</li> <li>display:none;是非继承属性，子孙节点消失由于元素从渲染树消失造成，通过修改子孙节点属性无法显示；visiblity:hidden是继承属性，子孙节点消失由于继承了hidden，通过设置visibllity：visible可以使子孙节点显示</li> <li>修改display:none通常造成文档重排，修改visiblity属性只会造成本元素的重绘</li> <li>读屏器不会读取display:none的元素内容，会读取visibility:hidden；元素内容</li></ul></li></ul> <h3 id="q3">3. link与@import的区别</h3> <ol><li>link是HTML方式，@import是CSS方式</li> <li>link最大限度支持并行下载，@import过多嵌套导致串行下载，出现FOUC(文档样式短暂失效)</li> <li>link可以通过rel=&quot;alternate stylesheet&quot; 指定候选样式</li> <li>浏览器对link的支持早于@import,可以使用@import对老浏览器隐藏样式</li> <li>@import必须在样式规则前引用</li> <li>总的来说，link优于@import</li></ol> <h3 id="q4">4. 什么是FOUC，如何避免</h3> <ul><li>Flash Of Unstyled Content：用户定义样式表加载之前对浏览器使用默认样式显示文档，用户样式加载渲染之后再重新显示文档，造成页面的闪烁</li> <li>解决方法
<ul><li>样式表放在文档的<code>&lt;head&gt;</code>标签内</li></ul></li></ul> <h3 id="q5">5. 如何创建块级格式化上下文(block formatting context),BFC的作用</h3> <ul><li><p>创建规则</p> <ul><li><p>根元素：HTML标签</p></li> <li><p>浮动元素：float</p></li> <li><p>绝对定位元素（position:absolute,fixed）</p></li> <li><p>display取值为inline-block、table-cell、table-caption、flex、inline-flex之一的元素</p></li> <li><p>overflow不取值为visible的元素</p></li></ul></li> <li><p>作用</p> <ul><li>可以包含浮动元素</li> <li>不被浮动元素覆盖</li> <li>阻止父子元素的margin折叠</li></ul></li></ul> <h3 id="q6">6. display、float、position的关系</h3> <ul><li>display取值为none，position和float不起作用</li> <li>定位、浮动、根元素都需要调整display</li></ul> <h3 id="q7">7. 清除浮动的几种方式，各自的优缺点</h3> <ul><li>父级div定义height属性</li> <li>父级内容结尾处添加空div,空div添加属性clear:both</li> <li>父级div定义伪类：after和zoom</li> <li>父级div定义overflow:hidden</li> <li>父级div也浮动，需要定义宽度</li> <li>结尾处加br标签clear:both</li></ul> <h3 id="q8">8. 为什么要初始化CSS样式</h3> <ul><li>因为浏览器的兼容问题，不同浏览器对有些标签的默认值是不同的，如果没对CSS初始化，往往会出现浏览器之间页面显示差异</li> <li>初始化样式会对seo产生一定的影响，力求影响最小的情况下初始化</li></ul> <h3 id="q9">9. CSS3有哪些新特性</h3> <ul><li>新增各种CSS选择器</li> <li>圆角border-radius</li> <li>多列布局</li> <li>阴影和反射</li> <li>文字特效text-shadow</li> <li>线性渐变</li> <li>旋转 transform</li> <li>CSS3新增伪类有哪些
<ul><li>p:first-of-type,匹配类型为p的第一个元素</li> <li>p:last-of-type:匹配类型为p的最后一个元素</li> <li>p:only-of-type:父节点下必须只有一个<code>&lt;P&gt;</code>元素</li> <li>p:nth-child(2):匹配父节点下的第二个类型为p的元素</li> <li>：after，在元素之后添加内容</li> <li>：before：在元素之前添加内容</li> <li>：enabled：已启用的表单元素</li> <li>：disabled：已禁用的表单元素</li> <li>：checked：单选框或复选框被选中</li></ul></li></ul> <h3 id="q10">10. display有哪些值，说明他们的作用</h3> <ul><li>block 转换为块级元素</li> <li>inline 转换为行内元素</li> <li>none 设置为不可见</li> <li>inline-block 行内元素一样显示，内容像块类型元素一样显示</li> <li>list-item 块类型元素一样显示，并添加样式列表标记</li> <li>table：此元素作为块级表格显示</li> <li>inherit：父元素继承display的值</li></ul> <h3 id="q11">11. 介绍一下标准的css的盒子模型？低版本的IE盒子模型有什么不同？</h3>
- 有两种：IE盒子模型，W3C盒子模型
- 盒模型：内容、padding、margin、border
- 区别：IE盒模型的content（内容部分计算了border和padding）
<h3 id="q12">12. CSS优先级算法如何计算</h3> <ul><li>优先级就近原则，同权重下样式定义最近者为准</li> <li>载入样式以最后载入的定位为准</li> <li>优先级为：!importment&gt;id&gt;class&gt;tag,</li></ul> <h3 id="q13">13. 对BFC规范的理解</h3> <ul><li>决定了元素如何对其内容进行定位，以及与其他元素的关系和相互作用</li></ul> <h3 id="q14">14. 谈谈浮动和清除浮动</h3> <ul><li>浮动的框可以向左或向右移动，直到他的边缘碰到包含框或另一个浮动框的边框为止，由于浮动框不在文档的普通流中，所以文档的普通流的块框表现的就像浮动框不存在一样，浮动的块框会漂浮在文档普通流的快框上</li></ul> <h3 id="q15">15. position的值，relative和absolute定位原点是</h3> <ul><li>absolute:生成绝对定位的元素，相对于static定位以外的第一个父元素进行定位</li> <li>fixed：生成绝对定位的元素，相对于浏览器窗口</li> <li>relative，生成相对定位的元素，相当于自己原来的位置</li> <li>static，默认值</li> <li>inherit：父元素继承position的值</li></ul> <h3 id="q16">16. display:inline-block什么时候不会出现间隙?</h3> <ul><li>移除空格</li> <li>使用margin负值</li> <li>使用font-size:0</li> <li>letter-spacing</li> <li>word-spacing</li></ul> <h3 id="q17">17. PNG\GIF\JPG的区别及如何选择</h3> <ul><li>GIF
<ul><li>8位像素，256色</li> <li>无损压缩</li> <li>支持简单动画</li> <li>支持boolean透明</li> <li>适合简单动画</li></ul></li> <li>JPEG
<ul><li>颜色限于256</li> <li>有损压缩</li> <li>可控制压缩质量</li> <li>不支持透明</li> <li>适合照片</li></ul></li> <li>PNG
<ul><li>png8和truecolor png</li> <li>png8类似GIF，颜色上限256，文件小，支持alpha透明度，无动画</li> <li>适合图标、背景、按钮</li></ul></li></ul> <h3 id="q18">18. 行内元素float：left是否变为块级元素</h3> <ul><li>更像是inline-block，变得可以设置宽高，可以设置padding-top,padding-bottom,但是默认宽度不为父级100%</li></ul> <h3 id="q19">19. 在网页中应该使用奇数还是偶数的字体？为什么呢？</h3> <ul><li>偶数字号相对更容易和web设计的其他部分构成比例关系</li></ul> <h3 id="q20">20. ::before 和:after 中双冒号和单冒号有什么区别？，解释一下这2个伪元素的作用</h3> <ul><li>单冒号（:）用于CSS3伪类，双冒号（::）用于CSS3伪元素</li> <li>用于区分伪类和伪元素</li></ul> <h3 id="q21">21. 如果需要手动写动画，你认为最小时间间隔是多久，为什么</h3> <ul><li>多数显示器的默认频率60HZ，即每秒刷新60次，所以理论上最小间隔为1/60*1000ms=16.7ms</li></ul> <h3 id="q22">22. CSS合并方法</h3> <ul><li>避免使用@import引入多个CSS文件，可以使用CSS工具将CSS合并为一个CSS文件，例如Sass/Compass</li></ul> <h3 id="q23">23. CSS不同选择器的权重</h3> <ul><li>!important 权重最高</li> <li>行内&gt;id&gt;类&gt;标签</li> <li>权值一样，后面写的生效</li></ul> <h3 id="q24">24. 列出你所知道可以改变页面布局的属性</h3> <ul><li>position、display、float、width、height、margin、padding、top、left、right</li></ul> <h3 id="q25">25. CSS在性能方面优化的实践</h3> <ul><li><p>CSS压缩合并、Gzip压缩</p></li> <li><p>css文件放在head中，不使用@import</p></li> <li><p>尽量缩写，避免用滤镜，合理使用选择器</p></li></ul> <h3 id="q26">26. CSS3动画（简单动画的实现，如旋转等）</h3> <ul><li>依靠CSS3中提出的三个属性：transition、transform、animation</li> <li>transition：定义了元素在变化过程中是怎么样的，包含transition-property、transition-duration、transition-timing-function、transition-delay。</li> <li>transform：定义元素的变化结果，包含rotate、scale、skew、translate</li> <li>animation：动画定义了动作的每一帧（@keyframes）有什么效果，包括animation-name,animation-duration、animation-timing-function、animation-delay、animation-iteration-count、animation-direction</li></ul></div></div>  <div class="page-edit"><div class="edit-link"><a href="https://github.com/linxin1123/vuepress-blog/edit/master/docs/08.面试/02.前端面试/01.基础篇/03.CSS篇(一)-cnblog.md" target="_blank" rel="noopener noreferrer">编辑</a> <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></div> <!----> <div class="last-updated"><span class="prefix">上次更新:</span> <span class="time">2023/02/26, 19:02:51</span></div></div> <div class="page-nav-wapper"><div class="page-nav-centre-wrap"><a href="/pages/77c7be/" class="page-nav-centre page-nav-centre-prev"><div class="tooltip">HTML篇(二)-cnblog</div></a> <a href="/pages/693182/" class="page-nav-centre page-nav-centre-next"><div class="tooltip">CSS篇(二)-cnblog</div></a></div> <div class="page-nav"><p class="inner"><span class="prev">
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